34 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



1031. Dicrocerus trilateralis Cope. I^ype. 



1 145. Portions of pelvis, sternum, and fragment of horn, associated 



with portions of the mandible containing teeth and frag- 

 ments of ribs. "lyOupFork" (Miocene), Valley of 

 the Rio Grande. 



Cope, Rept. U. S. Geogr. Surv. W. looth Merid., IV, Pt. II, 1877, 

 p. 357, pi. 8r, fig. 8, pi. 82, figs. 7-9. 



= ? Merycodus trilateralis. 



2880. Didelphops comptus (Marsh). Plesiotypes. 



2881. Right upper molar and exterior portion of right upper 



premolar. Ceratops beds (Cretaceous). Converse 

 County, Wyoming. 



Marsh, Amer. Journ. Sci. (3), XLIII, 1892, pi. 10, figs, i, 2. 



2883. Didelphops ferox (Marsh). Plesiotype. 



Right lower jaw. Ceratops beds (Cretaceous). Converse 

 County, Wyoming. 



Marsh, Amer. Journ. Sci. (3), XLIII, 1892, pi. 9, figs. 7, 8. 



2882. Didelphops sp. undet. 



lyOwer molar. Ceratops beds (Cretaceous). Converse 

 Count}', Wyoming. 



Marsh, Amer. Journ. Sci. (3) XLIII, 1S92, pi. 11, fig. 9. 



1092. Didymictis protenus (Cope). Type. 



Cope, Rept. U. S. Geogr. Surv. W. looth Merid., IV., Pt. 11, 1877, 

 P- 123, pl. 39. figs- 2-6. 



= Viverravus protenus. 

 See lyimnocyon protenus. 



1088 Didymictis protenus (Cope). Plesiotypes. 



to (i) Portion of left lower molar; (2) left lower jaw contain- 



109 1. ing five teeth, pg-ni^; (3) right lower jaw containing 



last molar; (4) portion of left lower jaw containing 

 last molar. Wasatch (Eocene). Gallinas Creek, New 

 Mexico. 



Cope, Rept. U. S. Geogr. Surv. W. looth Merid., IV, Pt. II, 1877, 

 ♦ p. 123, pl. 39, (i) fig. 9; (2) fig. I, la; (3) fig. 8; (4) figs. 7-7b. 



= Viverravus protenus. 



3957. Dinictis major I^ucas. Type. 



Skull and lower jaws with portions of skeleton. Lower 



Miocene. Bird Cage Gap, Bad Lands of Western 



Nebraska. 

 Lucas, Amer. Journ. Sci. (4), VI, 1898, p. 399. 



4212. Dinoceras distans Marsh. Plesiotype. 



Top of cranium. Eocene. Barrel Springs, Wyoming. 



Marsh, Mon. X, U. S. Geol. Surv., 1886, p. 14, fig. 4, p. 15, fig. 8. 

 1 181, Dipoides tortus (Eeidy). See Castor (Eucastor) tortus. 



